34 C.F.R. § 86.406
What must the ALJ do if the parties enter settlement negotiations?
(a) If the parties to a case file a joint motion requesting a stay of the proceedings for settlement negotiations or for the parties to obtain approval of a settlement agreement, the ALJ grants the stay.
(b) The following are not admissible in any proceeding under this part:
(1) Evidence of conduct during settlement negotiations.
(2) Statements made during settlement negotiations.
(3) Terms of settlement offers.
(c) The parties may not disclose the contents of settlement negotiations to the ALJ. If the parties enter into a settlement agreement and file a joint motion to dismiss the case, the ALJ grants the motion.